Is ABCB1 p.Ser309Phe (c.926C>T) pathogenic?

ABCB1 p.Ser309Phe (c.926C>T) is classified Uncertain significance in ABCB1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-26). AlphaMissense: likely pathogenic (0.9161); Absent from gnomAD v4.1.

How common is ABCB1 p.Ser309Phe (c.926C>T) in the general population?

ABCB1 p.Ser309Phe (c.926C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ABCB1 p.Ser309Phe (c.926C>T)?

AlphaMissense predicts likely pathogenic (score 0.9161) — an in-silico prediction, not a clinical call.

ABCB1 p.Ser309Phe

c.926C>T · VCV4097196

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9161 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9161	likely pathogenic
REVEL	0.766	pathogenic-leaning
SaProt	LLR -13.79	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.9	GERP 1.9, phastCons 1
Regional constraint	o/e 0.85	unconstrained · MANE · 96 kb · p 6.7e-09 · regional, not allelic
Overall
CADD	29.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ABCB1
Protein: p.Ser309Phe
Coding: c.926C>T
MANE Select: NM_001348946
Type: single nucleotide variant
Location: chr7:87553834 (GRCh38)
Gene constraint: LOEUF 0.575 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.72 · 24 PDB
Residue 309: the abc transmembrane type-1 1 domain; an α-helix

Full ABCB1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ABCB1 c.287-25G>T Benign ★★ same type
ABCB1 p.Ala1132= Benign/Likely benign ★★ same type
ABCB1 p.Gln1107Pro Benign/Likely benign ★★ same type
ABCB1 p.Glu243= Benign/Likely benign ★★ same type
ABCB1 p.Glu618= Likely benign ★★ same type
ABCB1 p.Gly412= Benign ★★ same type
ABCB1 p.Ile1145= Benign ★★ same type
ABCB1 p.Ile261Val Benign ★★ same type

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/abcb1-p-ser309phe (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown